**Detailed Analysis of Grease Performance and Selection for Sliding Bearings**
Home > Bearing Knowledge > "Sliding Bearing" Grease Performance and Selection Analysis
Source: China Bearing Network | Date: November 23, 2013
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As society continues to advance and mechanization becomes more widespread in production, bearings have become an essential component in various mechanical systems. Their application is growing rapidly due to the increasing demand for efficiency and precision in machinery.
When it comes to sliding bearings, proper lubrication with grease is crucial. Here are some key considerations when selecting the right type of grease:
1. **Grease Penetration and Load Considerations**
- For high-load applications with low rotational speeds, a grease with lower penetration should be used. Conversely, for high-speed operations, a grease with higher penetration and better mechanical stability is recommended. The base oil in such greases typically has lower viscosity.
2. **Dropping Point and Temperature Resistance**
- The dropping point of the selected grease should be at least 20–30°C higher than the operating temperature. In high-temperature environments, ensure that the grease does not exceed its maximum allowable temperature.
3. **Water Resistance for Wet Environments**
- If the bearing operates in a wet or humid environment, choose a grease with good water resistance, such as calcium-based, aluminum-based, or lithium-based greases.
4. **Adhesion Properties**
- Select a grease with strong adhesion to ensure it stays in place under dynamic conditions.
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### Grease Selection Based on Operating Conditions
| Load (MPa) | Journal Speed (m/s) | Max Temp (°C) | Recommended Grease |
|------------|----------------------|----------------|--------------------|
| <1 | <1 | 75 | Calcium Base No. 3 |
| 1–6.5 | 0.5–5 | 55 | Calcium Base No. 2 |
| >6.5 | <0.5 | 75 | Calcium Base No. 3 |
| <6.5 | 0.5–5 | 120 | Lithium Base No. 2 |
| >6.5 | <0.5 | 110 | Calcium-Sodium No. 2 |
| 1–6.5 | <1 | 50–100 | Lithium Base No. 2 |
| >5 | 0.5 | 60 | Calendering Grease No. 2 |
In humid environments:
- Between 75–120°C: Use calcium-sodium grease.
- Below 75°C: Calcium Base No. 3 or Aluminum Grease can be used.
- At 110–120°C: Lithium or thioester grease is suitable.
- For high-speed applications, a softer consistency is preferred.
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### Grease Reapplication Cycles
- **Occasional Operation (Unimportant Parts):**
- Shaft speed <200 r/min: Reapply every 5 days.
- Shaft speed >200 r/min: Reapply every 3 days.
- **Continuous Operation:**
- Operating temp <40°C:
- <200 r/min: Once per day.
- >200 r/min: Once per shift.
- Operating temp 40–100°C:
- <200 r/min: Once per shift.
- >200 r/min: Twice per shift.
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**Related Bearing Knowledge:**
- Bearing in Grinding (Part 2)
- Rolling Mill Bearing Protection Methods
- TIMKEN Imported Bearing Lubrication Enhances Bearing Life
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Rock Wool Sandwich Panel
What is rock wool Sandwich Panel? what is it used for?
The practicability of the rock wool sandwich panel is good, and it has a wide range of applications. Many buildings use this type of panel. But many people don't know much about its materials and uses, so let's introduce it in detail below.
making raw materials
The raw materials of rock wool sandwich panels are generally high-quality basalt, dolomite, etc., mixed according to a certain proportion, melted in a high-temperature blast furnace, and then made into fibers. After cooling, a certain amount of binder is added for rolling, so that the sandwich panel we use every day can be formed. Cutting of different sizes and specifications can be carried out, and the size and specifications of sandwich panels can also be customized.
Application range
In fact, rock wool sandwich panel are not only suitable for daily use in some buildings such as Steel Structure Warehouse, roofs and walls of Prefabricated House, but also can be used for more than 100 yuan, and can be used for soilless cultivation, and its annual use area is wide , City Volunteer Bank is indeed very good. Because it shows a slightly alkaline reaction in the initial stage, it is necessary to pay attention to the pH value when using the nutrient solution. After a period of use, the response will be neutral. Horticultural applications can be carried out according to daily application conditions, as well as water holding capacity, water tension, etc.
Advantages
The building construction industry uses this kind of sandwich panel mainly because of its excellent performance. It has very good fireproof performance, thermal insulation effect, and also has a certain sound absorption effect, so it is very suitable for use as a building material. Moreover, its rigidity is good and its strength is very good, and there will be no problems such as deformation and cracking, and it is also very suitable for long-term use.
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